1) It gave me the results I was looking for the "big beer buzz" plus I didn't know the difference of flavor when I started. Just thought that's how homebrews tasted, until I tasted a Hefeweizen & Blue Moon clone & they didn't taste much more differnt than each other. Tried a Guiness clone, didn't come close to Guiness. It's not awful flavor, just not a great flavor as with the other brews I've made.You've been brewing and drinking beer that you don't care for the taste of for 10+ years?
I would start from the beginning - buy a one gallon extract kit and brew it with distilled water. See if that has the same off flavor.
2) Won't buy a gallon extract kit. It's a waste of money so I'll just change my process.